Finding the Fourth Proportional to 143,401.60, 215,145.60 and 76,873.60

Step by Step Solution

1. Step 1: Write the proportion equation
   143,401.60 : 215,145.60 = 76,873.60 : x
2. Step 2: Convert to fraction form
   143,401.60/215,145.60 = 76,873.60/x
3. Step 3: Cross multiply
   143,401.60x = 215,145.60 × 76,873.60
4. Step 4: Simplify right side
   143,401.60x = 16,539,016,796.16
5. Step 5: Solve for x
   x = 16,539,016,796.16/143,401.60
6. Step 6: Final answer
   x = 115,333.56